To test if you are making improvements to your SD card's speed, SD Tools is a pretty good free application to use.

This profile is stand-alone and set to run on device boot. If you have another profile that is triggered in the same way, you can always delete this individual profile and then add a 'perform task' action somewhere in a current task to run SDCacheBoot

I'm not going to set up a separate thread for this, but you can always hunt me down on XDA if needs be.